Machine for facing or dressing gate valves



F. A. AND B. P. DEXTER IIND I. A. STUARD.

MACHINE f oR FACING 0R DRESSING GAT;y vmvEs. APPLICATION FILED IAN. 9.|920.

1,420.91 5 Patented June 27 1922.

3 SHEETS-SHEET I.

Inventwv M @l Avr/ZZV F.'A. AND B.'P. DEXTLER AND J. A. STUARD. MACHINEFOR FAcING'oR DRESSING GATE vALvEs.`

APPLICATION FILED MN. 9. 1920.

Patented June 27, 1922.

3 SHEETS-SHEET 2.

F. AI AND B. P. DEXTER AND J. A. STUARD.

MACHINE FOR FACING 0R DRESSING GATE VALVES.

. APPLICATION FILED IAN. 9, I92o.

1,420,915 PaIenIed Ime 27., 1922.

3 SHEETS--SHEET 3- Inventon.

UNITED STATES PATENT OFFICE;

FRED A. DEXTERAND BAYARD, P. DEXTER, QRANGELMASSAGHUSET-T,ANJAMES A.sTUAan, 0E HAnnIsBuns,A iEivNsYLvANIf-L; SAID: BAARD P, DEXTER ANDMACHINE FORv FACING QR DRESS1NG-GATE VALVES.

Application filed` January 9, 1920, Serial No. 350,409.

To all whom it may concern:

Be it known. thaty FRED, A. DEXTER` and BAYARDV P. DEXTER, citizens of*the United States, residing at. and whose post-office.- address isOrange, in the county ofi Franklin, State of Massachusetts, and JAMES A,STUARD, a citizen of the United States, resid# ing at and whosepost-office address is Harrisburg, in the county ofi Dauphin, State ofPennsylvania, have invented-certain new and useful Improvements inMachines. for Facing or Dressing Gate Valves; andi they do herebydeclare the following to besa: full, Clear, and exact description of theinvention, such as will enable others skilled'in thefart to which itappertains to make andzzusethe same.

The inventionrelates to yimprovements in machines for facingordressingvgate valves and has for `its objectto provide a. simple andefficient machine ofthe character described that is capable ofoperating. upon gate valves ofV various sizes and shapes to insure anaccurate surfacing ofthe face of the valve which engages: the valveseat.' To this end the invention comprises aitablelike base plateprovided withtwo clampingijaiws movable in opposite directions,longitudinally of the table, preferably by meansofY an oppositelythreaded screw shaft journalled below the table and engagingf twotravelling nuts, slidable in slots inthetable top, said nuts having apivotal Yconnection with the corresponding clamping jaws, each of whichlatteris provided witha pair of pivotal dogs, one mounted on eachlateral face thereof, each dog having an adjusting screw mounted thereinwhich regulates the elevation of the forward end of the-correspondingdog so thatj the severalV dogs may be adjustedto supportthe valve-andVbring the latter to a level to be engaged by the facing tool, when thevalve has been engaged bythe clamping jaws. In order to properly adjusta wedge shape valve for engagement-` bythe facing tool, the machine isprovided with a transversely sliding block or wedge which is adjustedunder the thin edge of the gate valve so as to bring the faceofv thelatter to a proper level. The machine also, includes a vertically.mounted toolengaging spindle capable; of quick adjustment toaccommodatevalves and tools of varying-thickness and also of a feeding adjustmentby means.: ofwhich thetoolf may be advanced toward the work to regulatethe extent of the: surfacing cut, saidfspindle being associated: with.alv discr likeA cutter provided: with adjustable. cutter knives, so thatwhen the lowe'i` end of.L the. spindle engages a central bearing in,the. back` face off the cutter the cuttingblades-or knives rest upon thevalve facev and. serveto trim or., cut themetal of thevalve face. tothedesired extent, as the cuttenis intermittently rotated by means ofa-,handle andraI friction bandassociated with the. cutter disc. l

In theaccompanying.drawings:

Fig, l: is a front. elevation of the machine showing `v the lower; endofi the tool,` spindle readyfto engagel the rotary cutter.y

Eig,A 2is: aplan view of the machine with the standard and tool spindleremoved.

Fig-5 3zis.:an.end elevation of the machine.

Fig. 4 is a plan view of the rotary-cutter.

lReferring tothe drawings, 1 indicates a tableor-.base plate, onthelopposite endsl of `which are/.mounted standards 2, 2, supportv` ingalcrossipiece 4, the several'elements being securedjtogether by suitablebolts.

Runninglongitudinally of the .upper sur# face of the base plateisa rib 5provided with two long ggitudinalfI slots,V 5', 5', which slottedr-ibfcunstitutesia guide or track Way for two clamping jaws'.l 6, 6,which are adapted. to loe-moved toward. and'` from each other` forthe.purpose ofY engaging and:l clampingl the laterabedgesrofra,gate. valveor similar ele ment; whichisto be dressed or faced'by the cut-ting7tool, Concurrent; movement ofthe clamping jawsK yin oppositeydirectionsy is effected by means of a shaft 9. journalled inbearingsl'l, 12 and-1.13 below the upperface offthe'base plate. l, -saidshaft being pro-y videdwith oppositely disposed threaded sec.-k tions,which engagev nuts 7, 7, extending throughthe s1ots5, 5., and connectedrespectively. tothe?.y clamping jaws 6, y6 by means offpivot, bolts 8,-8, extending through the clamping jawsand permitting. an independentswiveling action ofl the respective jaws The valve, env aging faces ofthe clamping jaws,- arey ormed as re-entrant angles which., cooperatewith the swiveling actiony off the respectiver jaws to accuratelycenterthevalve, when thejawsare setA up.

Pivoted at, lto each forwardlateralface ofi eaohof theclamping jaws 6vis a dog l5' specieatioaofLetters-13mm., Patented Juner27, 1922. c

having a screw 17 passing through the same, with its lower end inengagement with the top of the base plate to enable theouter end of thedog to'be raised and lowered to' engage the under face or marginal edgeof the valve so that by properly adjusting the four dogs l5 the valvemay be accurately levelled, so that its face to be dressed or trimmedwill be brought to a true horizontal plane. Then the valve, however,isgofsuch shape as to be supported directly upon the base plate the dogsl5 may be swungfbackward on their pivots out of engaging relation. A

`When`a wedge shape gate valve is to be faced by 'the machine, it isnecessary to provide means for accurately supporting the thin edge ofthe valveand hold the valve in its accurately levelled position betweenthe clamping jaws 6, 6. To effect this object the base plate is providedwith a transverse track way20 provided with a longitudinal slot 2l toreceive a sliding wedge member 23, tapering toward the center of themachine and having a dependent lug 24 which engages and is guided inthefslot 2l.' The upper face of the track way 20, and the lower face ofthe wedge 23 are provided with mating ratchet teeth 22, which serve tolock the wedge in its adjustedposition thereby preventing a lateralcanting movement of the valve, after the same hasV been clamped by thejaws 6.

Mounted in a central hollow boss 30 in the cross piece 4 and in verticalaxial alignment with the center of the base plate l,.is a sleeve 3lhavingl an integral collar 32 secured to the upper face of -the boss 30by studs 33 and locked to the under face of cross piece 4 by a set nut34. The upper and lower ends of the sleeve 3l are interiorly screwthreaded for a short distance to pro; vide a suitable engagement for thethreaded tool spindle 4l. rPhe ends of theA sleeve 3l are provided withlongitudinal slots 35 and 38 respectively and are also provided withtapered threaded sections 36 and 39, which are engaged by lock nuts 37rand 40 so that whenthe said lock nutsare set up on the threaded ends ofythe sleeve the interior threaded portions of rthe sleeve engage thecorresponding screwi threads on theL tool spindle 41. ldhen, however,the lock nuts 37 and 40 are partially backed off the exterior taper endsofvthe sleeve, the slotted ends of the sleeve expandandr release thetool spindle`4l so that the latter may be moved bodily'longitudinally ofthe sleeve in a vertical direction, thereby providing for a quickadjustment of the tool spindle with respect tov the tool and the work.When the said nuts 37 and 40 are set up, however, the tool spindle canonly be advanced or retracted by rotating the spindleby means of thehand wheel 42, as the threads on the spindle are in engagement with theinterior threads of the sleeve aforesaid. This latter operationconstitutes the feeding adjustment of the tool spindle.

The", said tool spindle is provided in its lower end with a stud 43engaging a socket in the spindle end, and having a rounded 'jboss 44 atits lower end adapted to engage a concave recess in the center oftheback of theicutting tool.

.An eliicient form vof cutting tool for use of the machine as describedis illustrated in F ig. 4 and comprises a disc member 50 hav ing aicentral opening 5l, which on the rear face is enlarged to form a concavesocket to receive the hemispherical boss 44 on the lower end of the toolspindle. Disposed around the outer edge of the disc 5() is a series ofclamping studs 52, each adapted to receive a cutting blade 53, saidblades being' equilaterally triangular in cross section so that any oneof the edges may be presented to the work. These blades are each set atan angle to the radii of the disc 50 and may be adjusted longitudinallyin the clamping members 52 to accommodate valves of varying diameters.The cutting disc 50 is adapted to be superposed on the face of the valveto be surfaced or cut, in the position shown in Fig. l,- so that thecutting edge of each of the tools 53 is in engagement with the valveface. The tool spindle is then turned down so that the boss 44 on thelower end thereof engages the recess 5l in the center of the cutter discand rotary movement is imparted to the cutter disc by means of afriction band 54 which surrounds the peripheral edge of the cutter disc,said band being secured at one end to a block 55, in which is pivoted alever 56,- 57 to the lower end of which the other end of the band 54 issecured by a pin 58, the band being normally held taut, by means of aspring 59 interposed between the socket member 57 of the lever andabutment- 60 secured in the block 55.

When the parts have been, assembled, with the valve in proper position,and the screw spindle brought into engagement with the cutter. disc,rotary movement of the lever 56 in a clockwise direction tightens up thefriction band 54 and imparts rotary movement to the cutterdisc. Movementof ythe lever in an opposite direction releases the friction band 54from its gripping engagement with the edge of the cutter disc andpermits of the band being slid peripherally around the disc withoutreversing the movement of the disc. Intermittent rotary movement of thelever and friction band 54 in opposite directions, therefore, providesan intermittent rotary movement of the cutter disc in one direction sothat a few turns of the disc will be effective in resurfacing the valveface, the extent of the cutting action being regulated by the feeding`movement of the screw 4l under control of the operator.

It will be noted that the range of the movement of the clamping jaws 6is large and, therefore, that the machine is capable kof receiving andoperating upon valves of various sizes, and as each machine is providedwith cutter discs of varying size, it will be apparent that a singlemachine is adapted to operate upon gate valves of widely varyingdimensions, and may be employed with equal facility with valves of theordinary disc type or of the tapered or wedge type.

In operating upon valves of slightly different sizes it is necessary toadjust the cutters 53 longitudinally in their clamping supports, and tofacilitate this operation one of the standards 2 is provided with alaterally projecting stud 63 upon which the cutter disc is adapted to besupported, by engaging the central opening 51 in the disc with the stud63, thereby permitting the disc to be held in any desired position onthe stud 63, by means of the lever 56, while the individual cuttermembers are properly adjusted.

What we claim is:

l. A facing machine for gate valves and the like, comprising a baseplate, a pair of oppositely disposed clamping jaws having re-entrantwork engaging faces slidably mounted thereon, a feed screw havingoppositely disposed threads mounted on said base plate, nuts engagingthe threaded sections of said feed screw, and a support having aninclined upper face mounted for sliding adjustment transversely of thebase plate.

2. A facing machine for gates valves and the like, comprising a baseplate, a pair of clamping jaws slidable longitudinally of the' baseplate, means for simultaneously moving the said jaws toward and fromeach other, including connections permitting a swiveling movement of thejaws, and a valve supporting wedge adjustable transversely of the baseplate.'

3. A facing machine for gate valves and the like, comprising a baseplate, a pair of jaws slidable longitudinally of the base plate, a pairof work supporting dogs pivoted laterally of each jaw, means to adjusteach dog with respect to the base plate, and means for simultaneouslymoving the jaws toward and from each other.

4. A facing machine for gate valves and the like, ycomprising a baseplate, a pair of jaws slidable longitudinally of the base plate, a pairof work supporting dogs pivoted laterally of each jaw, means to adjusteach dog with respect to the base plate, and means for simultaneouslymoving the jaws toward and from Leach other, including connectionspermitting a swiveling movement of the jaws. k

5. A facing machine for gate valves and the like, comprising a pair ofclamping jaws slidable longitudinally of the base plate, means forsimultaneously moving said jaws toward and from each other, valvesupporting dogs pivoted on each side of the clamping jaws, means foradjusting the height of the ends of the dogs with respect to the baseplate, and a support having an inclined upper face mounted for slidingadjustment transversely of the base plate.

6. A facing machine for gate valves and the like, comprising a baseplate, a standard thereon, a vertical tool spindle mounted on saidstandard, a pair of clamping jaws slidable longitudinally of the baseplate, means for simultaneously moving said jaws toward and from eachother, a wedge support ad justable transversely of the base plate, and afacing tool engaging the lower end of the tool spindle.

.7. A facing machine for gate valves and the like, comprising a haseplate, a standard thereon, a vertical tool spindle mounted on saidstandard, a pair of clamping jaws slidable longitudinally of the baseplate, means forvsimultaneously moving said jaws toward and from eachother, valve/supporting dogs pivoted laterally 0f eachk jaw, means foradjusting each dog with respect to the base plate, a wedge supportadjustable transversely of the base plate, and a facin tool engaging thelower end of the too spindle.

FRED A. DEXTER. BAYARD P. DEXTER. JAMES A. STUARD. Vitnesses as to FredA. Dexter and Bayard P. Dexter:

B. C. BANGs, Cona E. BANGs. Witness as to J as. A. Stuard:

GEO. D. HERBERT.

